在 D 中将成员函数作为模板参数传递
我创建了一个类，它实现了阿特金筛法来查找素数。该类存储结果并提供“isPrime”方法。我还想添加一个范围，允许您迭代素数。我在想这样的事情：
@property auto iter() { return filter!(this.isPrime)(iota(2, max, 1)); }
不幸的是，这不起作用：
Error: function primes.primes.isPrime (ulong i) is not callable using argument types ()
Error: expected 1 function arguments, not 0
没有“this”我得到
Error: this for isPrime needs to be type primes not type Result
有没有办法将成员函数作为模板参数传递？
I created a class which implements the Sieve of Atkin to find primes. The class stores the results and provides an "isPrime" method. I would like to also add a range which allows you to iterate over the primes. I was thinking of something like this:
@property auto iter() { return filter!(this.isPrime)(iota(2, max, 1)); }
Unfortunately this doesn't work:
Error: function primes.primes.isPrime (ulong i) is not callable using argument types ()
Error: expected 1 function arguments, not 0
without the "this" I get
Error: this for isPrime needs to be type primes not type Result
Is there any way to pass a member function as a template argument?
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您不能将方法（委托）用于模板参数，因为它们需要上下文，而上下文在编译时是未知的。
您可以将
isPrime设为静态方法或自由函数（然后删除this.并且您的代码将正常工作），或者（如果该方法不是有意静态的），使用匿名委托文字：在 2.058 中，您将能够编写：
You can't use methods (delegates) for template parameters, because they need a context, which is not known at compile-time.
You can either make
isPrimea static method or free function (then removethis.and your code will work), or (if the method is not static on purpose), use an anonymous delegate literal:In 2.058 you'll be able to write:
您需要传递函数的地址，否则编译器认为您想使用 0 参数调用该函数，然后传递结果
you need to pass the address of the function otherwise the compiler thinks you want to call the function with 0 args and then pass the result